Carl schlickeysen



(No Model.)

0. SGHLIGKEYSEN. GOUPLING FOR PULLEYS.

N0. 490,313. x Patented Jan" 24, 1893.

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UNITED STATES Parana since.

CARL SCHLICKEYSEN, OF BERLIN, GERMANY.

COUPLING FOR PULLEYS.

SPECIFICATION forming part of Letters Patent No. 490,313, dated January24, 1893.

Application filed September I 1892. $erlal No. 444,781. (No model.)

To all whmn it may concern:

Be it known that I, CARL SCHLIGKEYSEN, a subject of the Emperor ofGermany, residing at Berlin, Prussia, Germ any, have invented a.

certain new and useful Improvement in Couplings for Pulleys; and I dohereby declare that the following is a full and exact descriptionthereof.

The invention has for its object to provide a cheap and easily replacedcoupling which will break when the machine is too greatly strained andthereby avert the greater evil, the breaking of the more expensive partsof the machine. For obtaining this object the power-transmitting pulleyis fitted loosely on the shaft and united by means of a cheaply madeconnection which I will term a link, with a stout part, as an arm,strongly fastened on the shaft. The cross-section of this link is sosmall that it will break when a certain traction power is exceeded. Uponthis occurring the pulley wili run loosely on the shaft, and will notagain transmit power to the working machine until it has been repairedor a new link supplied. A spare link may be kept in readiness to besupplied, and a refitting of my machine after a breakage fromover-straining, is very easily and rapidly accomplished.

The accompanying drawings form a part of this specification andrepresent what I consider the best means of carrying out the invention.

Figure 1 is a side elevation of the main part with a cross-section ofthe shaft. Fig. 1 is a side elevation of a portion corresponding to theform shown in Fig. 1, with a modification. Fig. 2 is a longitudinalsection. The main portion of the arm fixed on the shaft is in elevation.The remaining figures show modifications. Fig. 3 is a side elevation andFig. 4 a corresponding longitudinal section showing a modification. Fig.5 is a side elevation and Fig. 6 a corresponding plan view showinganother modification. Fig. 7 gives two views of another form of thelinkdetached.

Similar letters of reference indicate corresponding parts in all thefigures where they appear.

Referring to Figs. 1 and 2, on the main shaft a. are placed two pulleysb and c. The pulley b is intended to remain always loose,

and to perform the usual duties of a loose pulley in carrying thedriving belt idly when required. Nearthe pulleyc an arm cl is stronglyand rigidly fixed on the shaft. The pulley c and arm cl are unitedtogether by an obliquely mounted coupling piece e of moderate strength,which I term a link, by means of which, when the pulley rotates in thedirection of the arrow, under all ordinary and proper strains, the arm(I and consequently the shaft or will be rotated in the same direction.The coupling link will thus be used for traction, or for being broken.Its resistance will depend on its crosssection, and on the material ofwhich it is made, and may easily be adapted to the maximum working forceto be transmitted to the shaft (1. If, from any cause this strain isexceeded, then the link a. connecting to the arm cl, will break, and theshart a being deprived of its driving force will stop and thedestruction of any other part of the machine will be avoided.

The coupling or link 6 may consist of a loop or elongated coil of wire,as shown by two examples in Fig. 1. The loop may at one point be securedto a part on the pulley, for example, extending directly around an arm 0thereof, and at the other end secured around a reduced portion 01 of thearm (Z fixed on the shaft. The wire-ends may be twisted or in any otherway joined reliably together. By the number of coils in the wire linkthe strain may be determined which is to be transmitted through themachine.

Figs. 3 and 4 show a coupling in the form of an oblong ring or link 2'which at one end engages with a pin 0 set in an arm of the pulley and atthe other end with a pin 01 set in the arm cl keyed on the shaft.Instead of such a link there may be provided, as shown in Figs. 5, 6 and7, a link e or e which may consist of a flat rod of a determinedcross-section, or of a piece of sheet-metal. There may be several thinparts a applied side by side, each with an eye in each end: This lastconstruction oders the advantage that by taking off or adding parts thelink may be made of different resistances, and thus there may bedetermined exactly the working strain which is not to be exceeded.

In Figs. 5 and 6, instead of an arm d, there is shown a pulley'f solidlykeyed on the shaft Ct, which arrangement offers a greater securityagainst accidents than does the arm (Z.

Other modifications may be made. Instead of thestrain on the link orcoupling e being tensional, it may be a thrusting strain, in which caseit will be arranged behind instead of before the arm (Z. In generalthebreaking link stands oblique, with one end secured to thepower-transmitting pulley, and the other secured to a part fastenedsolidly to the shaft and rotating with the same, as for example, acog-wheel, an arm or a wheel. The oblique or inclined position of thelink allows the strain to be transmitted successfully so long as thelink endures, While the pin in the arm is so much out of the path of thepin or other portion of the pulley to which the link is attached, thatthey pass each other without contact when, as will often occur, one partcontinues to revolve after the other has stopped.

In Fig. l the link is marked 6 In the form shown in Figs. 1, 1 and 2,the inclination is in the direction longitudinal to the shaft. After therupture of the link the pin d will pass the arm 0, to which the link haspreviously attached it, without contact. by reason of the fact that thearm d and its pin (1' travel in a path which is out of the plane ofthetravel of the arm 0.

In the arrangement shown in Figs. 3 and l. and also in that shown inFigs. 5, and 6, the obliquity is in the direction radially to thepulleys, one pin passing within or nearer the axis of motion than theother. The word incline applies to both these classes of relations.

I claim as my invention:

The combination of the pulley, the arm and the inclined, breakable linkconnecting said arm and pulley, adapted to serve substantially as hereinspecified.

In testimony whereof I have hereunto set my hand, at Berlin, this 29thday of July, 1892. in the presence of two subscribing witnesses.

CARL SOHLICKEYSEN.

Witnesses:

L. A. EDW'ARDS, W. HAUPT.

